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Date: Tue, 16 Sep 2003 11:23:18 -0700 (PDT)
From: Rick Rankin <rick_rankin AT yahoo DOT com>
Subject: Re: Setup installation order?
To: cygwin AT cygwin DOT com
In-Reply-To: <Pine.GSO.4.56.0309161356460.12411@slinky.cs.nyu.edu>
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--- Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu> wrote:
> On Tue, 16 Sep 2003, Rick Rankin wrote:
> 
> > I ran into a situation I hadn't seen before a few days ago when I used
> > setup to update my Cygwin installation from 1.5.3 to 1.5.4. What
> > happened was that there were several packages, in addition to
> > cygwin-1.5.4, that had updates available. Setup downloaded the updates,
> > then uninstalled the old packages, including cygwin-1.5.3. When it went
> > to install the updates, cygwin-1.5.4 was *not* the first package that
> > got installed, so any postinstallion scripts failed with a dialog box
> > from the O/S saying that "Windows cannot find cygwin1.dll in <path
> > list>" until after cygwin itself was updated. After setup installed the
> > cygwin package, the rest of the postinstall scripts ran fine.
> >
> > Is the cygwin package given any special consideration during the install
> > process (e.g., last to be uninstalled, first to be (re)installed), or is
> > this something that's expected to be handled by the dependency list?
> > I've been perusing the setup sources, but I haven't quite figured out
> > the dependency processing, yet. So far, I haven't found anything related
> > via Google searches, either.
> >
> > --Rick
> 
> The setup program simply performs a topological sort of the package
> dependence graph, and then traverses the packages in that order.  Of
> course, since the graph is cyclic, topological order is not unique.  In
> any case, the postinstall scripts should run after *all* the packages are
> unpacked, so you shouldn't be missing cygwin1.dll on postinstall.
> 
> However, preremove scripts are run just before the corresponding package
> is removed (in alphabetical order, IIRC).  This presents a problem, but
> noone so far has considered it a large enough problem to invest the effort
> in a fix.  It's likely that you saw this particular problem in your
> upgrade.  <http://cygwin.com/acronyms/#PTC>.

Ahh, that's entirely possible. At the time, I wasn't paying enough attention to
notice whether the problem occurred during preremove or postinstall. For
whatever reason, I *assumed* it occurred during postinstall.

If that's the case, this particular problem could be solved by pushing the
cygwin package to the end of the package removal list, which is probably where
it should be anyway; however, that wouldn't solve the more general ordering
problem. Time permitting... ;-)

--Rick

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